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1 Quarterly Report - Second Quarter 2004 <br /> LARRY'S AUTO <br />' 308 North Grant Street, Stockton, California <br /> 1.0. INTRODUCTION <br /> 'At the request of Mr Charles Skobrak,Advanced GeoEnvironmental,Inc (AGE)has prepared this <br />' quarterly report for the property located at 308 North Grant Street, Stockton, California (site) The <br /> scope of work included a quarterly groundwater monitoring event and preparation of this report The <br /> location of the site and the surrounding area are Illustrated on Figure 1 Structures and monitoring <br />' well locations at the site are illustrated on Figure 2 Site background information is provided in <br /> Appendix A <br /> 1 <br /> 2.0. PROCEDURES <br />' Field work was performed in accordance with guidelines issued by the California Regional Water <br /> Quality Control Board - Central Valley Region (CVRWQCB) for Investigation of underground <br />' storage tank (UST) sites Procedures for the sampling of the monitoring and extraction wells were <br /> described in the AGE-prepared Work Plan Addendum, dated 15 December 1995, and Quarterly <br /> Report -August 1997 <br /> 2 1 j WELL MONITORING AND PURGING Ju,.t_Y, <br /> ds fir, J v lir-3) 200S! t�Jq /c�4h Vm <br />' On 0 une 2004, a Solinst water level meter was used to measure the depth to ground water in five <br /> gr= water monitoring wells and five vapor extraction wells relative to the tops of the well <br />' casings The ground water elevations and gradient were determined from this data (Table 1) <br /> After recording water level measurements, a Waterra Hydrolift Pump was used to purge monitoring <br />' wells MW-'1 through MW-4, MW-7, VW-3, and VW-4 of standing water, dedicated disposable <br /> plastic bailers were used to purge the remaining wells of standing water The wells were generally <br />' evacuated in order of least contaminated to most contaminated,based on previous monitoring data <br /> Between 17 and 19 gallons of water (a minimum of three casing volumes) were purged from <br />' monitoring wells MW-1 through MW-4, and between 9 and 12 gallons of water were purged from <br /> monitoring well MW-7 and vapor extraction wells VW-2B, VW-3, VW-4, and VW-5C <br /> Approximately 3 gallons of water were removed from vapor extraction well VW-5B Ground water <br />' temperature,pH,and conductivity were measured at regular intervals during the purge process using <br /> an Oakton water analyzer Purged water was stored on site in properly labeled,55-gallon Department <br /> of Transportation (DOT)-approved drums The field data sheets are included in Appendix B <br /> 1 J <br /> 1 Advanced GeoEfiWonmental,Inc <br /> 1 � <br />